Staybolt structure for boilers



J. R. FLANNERY AND E. I. DODDS.

STAYBOLT STRUCTURE FOR BOILERS.

Patented J an! 4, 1921.

m N w m UNITED STATES PATENT OFFICE ASSIGNORS TO FLANNERY BOLT COMPANY, OF PITTSBURGQH,;;REITNSYLVANIAL .g, STAYBOLT STRUCTURE FOR BOILERS Application filed September 10, 1919. Ser'i a To all whom it may concern e it known that we, JOHN Roonns FLAN- NERY and ETHAN I. DODDS, citizens of the United States, and residents of Pittsburgh, in the county of Allegheny and State of Pennsylvania, have invented certain new and useful Improvements in Staybolt Structures for Boilers; and we do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

This invention relates to improvements in staybolt structures for boilers,one object of the invention being to provide a simple form of mounting for the headed end of a staybolt which will become so disposed as to insure proper and accurate alinement of the staybolt relatively to the points of connection of the staybolt with the respective boiler sheets.

A further object is to provide a staybolt structure embodying a bearing sleeve or bushing which shall have a universally movable mounting in the outer boiler sheet, without necessity of curving or rounding the wall of the opening in the boiler sheet transversely of the latter or of curving or rounding the exterior of the sleeve or bushmg.

vVith these and other objects in view the invention consists in certain novel features of construction and combinations of parts as hereinafter set forth and pointed out in the claims.

In the accompanying drawings; Figure 1 is a sectional view showing an embodiment of our invention; Figs. 2 and 3 are views illustrating different positions which the sleeve or bushing may assume in the conical or tapering opening in the boiler sheet, and Fig. 4 is a view showing a modified construction.

1 represents an outer boiler sheet and 2 the inner sheet of a boiler.

The outer boiler sheet is provided with openings, such as indicated at 3 for the accommodation of the mounting for the head 4i of a staybolt 5,the inner end of the latter being passed through suitable holes in the inner boiler sheet and secured in any suitable manner.

The opening 3 in the outer boiler sheet is made tapering with its larger end coincident with the outer face of the sheet and its ati'ngaat the sheet, a ndi-tlie wttllfiof made straigh A sleeve oi" g opening 3 straight bushing is bearing 8 foi T staybolt. The sle e 0 or cylindrical i engages the wall 6 J termediate the ends of capable, therefore" which will staybolt with he points of-conne'c (sneer the latter w'i the *resp'e ctive boiler" when the holes the inner 'Shetddhot' ac curately aline with the holes in the outer sheet, or where the two sheets are not parallel with each other. Inthe embodiment of the invention shown in Fig. 1, the internal bearing for the bolt head is in proximity to the inner end of the sleeve and the latter is externally threaded at its outer end for the reception of a cap or closure 9 which closes the outer end of the sleeve.

In Fig. 2, we have shown the straight bearlng sleeve or bushing 7 a mounted in the conical opening 3, so as to be disposed at an smaller end terinin bushing 7 is stra ght internal bearing 8 for the bolt head is located intermediate the ends of the sleeve, the lower or inner portion 8 of the bore of the latter being made flaring to permit the lateral play of the bolt.

In the embodiment of theinvention shown in Fig. 8, the sleeve 7 is similar to the sleeve 7 a but somewhat shorter than the latter, and the said sleeve 7 is shown as passing nearly through the tapering opening 3 in the boiler sheet and bearing against the straight wall 6 thereof near the inner end of said opening. The rounded head 4* of a bolt 5 has its bearing in the sleeve 7*.

In Fig. 4, we have shown a straight sleeve c somewhat similar to the sleeves 7 and 7 mounted in the opening 3 in the outer boiler sheet and disposed at an an de to the axis of said opening. This sleeve I may be enlarged at its outer end, as at 10, thus forming an annular shoulder 11, and this enlarged portion is threaded internally to receive the threaded portion of a plug or closure 12.

In all of the forms of the invention, the sleeve or bushing is secured to the outer boiler sheet after having assumed its correct position to insure proper alinement of the staybolt. The sleeve or bushing is so secured to the outer boiler sheet that a permanent union shall be effected and so that the metal of the sleeve shall become an integral part of the metal of the sheet. This is accomplished by a weld 13 which surrounds the sleeve and unites it integrally with the boiler sheet.

When the form of sleeve shown in Fig. 4; is employed and the sleeve is disposed as indicatedin said figure, a portion of the Weld 13 may unite the shouldered portion of the sleeve to the boiler sheet, as indicated at 14.

Having fully described our invention what we claim as new and desire to secure by Letters-Patent, is

1.. In a staybolt structure, the combination with a boiler sheet having a tapering opening, the wall of which is straight transversely of the sheet, of a bearing sleeve or bushing of cylindrical form and having an internal bearing for the head of a staybolt, said bearing sleeve or bushing having an initial universally movable bearing on said straight wall of the tapering opening, and a staybolt having a head mounted in said sleeve or bushing.

2. In a staybolt structure, the combination with a boiler sheet having a tapering opening, the wall of which is straight trans versely of the sheet, of a cylindrical bearing sleeve or bushing having an initial universally movable hearing at one end against said straight wall of the tapering opening in the boiler sheet, a staybolt having a head mounted in said sleeve or bushing, and a weld surrounding said sleeve or bushing and integrally uniting the same to the boiler sheet.

In testimony whereof, we have signed this specification in the presence of two subscribing witnesses.

JOHN ROGERS FLANNERY. ETHAN I. DODDS.

I/Vitnesses JAMES R. HORAN, EDWIN S. RYoE. 

